The classification of a daffodil cultivar (cultivated variety) is based on the description and measurements or the classification submitted by the person registering the variety.
Colour codes used to describe the colour of daffodils are as follows:
W - White or Whitish
Y - Yellow
P - Pink
O - Orange
R - Red
All daffodils are classified into one of the thirteen divisions described below:
Division 1 - Trumpet
One flower to a stem, corona (trumpet or cup) as long or longer than the perianth segments (petals).
Division 2 - Large Cup
One flower to a stem, corona (cup) more than one third but less than equal to the length of the perianth segments (petals).
Division 3 - Short Cup
One flower to a stem, corona (cup) not more than one third the height of the perianth segments (petals).
Division 4 - Double
Daffodils have a clustered cup, petals or both. There can be one or more flowers per stem.
Division 5 - Triandrus
Usually more than one flower to a stem, head drooping, perianth segments often reflexed and of silky texture.
Division 6 - Cyclamineus
One flower to a stem, perianth significantly reflexed and corona straight and narrow. Some exceptions exist.
Division 7 - Jonquilla
Usually several flower heads to a stem, flowers usually fragrant, stem is round in cross-section and foliage is often rush like.
Division 8 - Tazetta
Usually three to twenty flowers to a stout stem, sweet scented and very short cupped. Perianth segments rounded and often somewhat crinkled.
Division 9 - Poeticus
Usually one flower to a stem. White petals sometimes stained with the corona color at the base, small flat cup edged with red, but sometimes wholly or partly of other colours. Fragrant.
Division 10 - Bulbocodium Hybrids
Small flowers resemble a "hoop petticoat" form.
Division 11 - Split Corona
Corona split - usually more than half its length.
a) Collar Daffodils
Split-corona daffodils with the corona segments opposite the perianth segments; the corona segments usually in two whorls of three
b) Papillon Daffodils
Split-corona daffodils with the corona segments alternate to the perianth segments; the corona segments usually in a single whorl of six
Division 12 - Other Cultivars
Daffodils not falling into any of the previous categories.
Division 13 - Species
All species and reputedly wild forms.